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    BME680: Correlation between supply ripple and settling time of accuracy value

    BME680: Correlation between supply ripple and settling time of accuracy value

    yossie
    Member

    Please tell me.
    I'm thinking of using a DC/DC power supply to power the BME680.
    Is there a correlation between the magnitude of the power ripple and the settling time of the accuracy value even if the power ripple is 50mVpp or less?
    If the ripple is large, does it take time for the accuracy value to settle down?

    5 REPLIES 5

    BSTRobin
    Community Moderator
    Community Moderator

    Hi yossie,

    Could you give more description of "settling time of the accuracy value"?

    Hi, BSTRobin.

    We are considering with making more than 10 prototypes of gas sensors using BME680. Attached is the measurement graph using 3 of them. These three units are placed in a glass bottle and placed in the same environment. This measurement graph is fairly complete, but IAQ Accuracy may remain at 1 for several hours. This device BME680 has strict requirements for power supply ripple, so I asked a question the other day because I was worried about the circuit design. What is the relationship between power supply ripple and IAQ Accuracy?

    BSTRobin
    Community Moderator
    Community Moderator

    Hi yossie,

    According to the requirements of BME680 data sheet, the power ripple should be less than 50mVpp.

    If the power ripple is large, the accuracy value will stabilize. It will not affect the stability time too much, but will affect the test results. Therefore, the hardware should be designed according to the power ripple requirements in data sheet.

    Hi BSTRobin,

    Thank you. We modified the DC/DC power supply IC so that the supply ripple is less than 50mVpp.

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